The "smiling G" logo, originally used by Boston-area member Morgan Memorial Goodwill Industries, was trademarked in 1967, but did not see national use until March 1968.
Alternate variant
The current general logo for Goodwill Industries International.
A version of a regional logo - this one in particular is from Goodwill's largest affiliate.
Alternate "cartoonish" logo used by some Goodwill Industries members.